To elaborate on something I referenced in my post "Comparing geometry between brands will vary", that's because how far back from a more focused performance model designers choose to dial back to their more compliant models will vary. In the case of the Specialized Tri Cross looking at the
current geometry personally I'd still list that as a Gravel Bike, all be it one closer to a CX geometry than my example of a Van Nicholas
Rowtag, using that example yes it's more focused towards a CX set up but the geometry will still offer stability to carry luggage.
One brand may have one model that they hope will tick both boxes and another brand may have one design for each, with the example I used I referenced Van Nicholas as they have a CX and Gravel bike at the same price point, so each can have a more focused set up specific to that role. I dare say being European a CX focused bike is more on their radar than an American brand who no doubt feel their is not enough demand to have a focused bike for each role. Laterally thinking the same applies to Van Nicholas of course, they are a European brand and make bikes for that market. Back in 2001 when they were called Airborne and starting to supply to the UK they did not have an Audax style lightweight tourer, a popular bike here in the UK but not in Europe so they did not cater for a demand they didn't have; so I help design the bike that became the
Yukon.